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With allocateTTY, nixos-rebuild runs with a terminal, so it shows colours
and progress: on remote targets, ssh gets -t, which allocates a terminal
if its own input is one, and on the local target, expect's unbuffer
provides one.
The nixos-rebuild stand-in records whether its output is a terminal.
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A ref that consists of 4 to 40 hex digits is a commit, which populate
fetches only if the work tree lacks it, unless fetchAlways is set. Any
other ref is a branch or tag, which populate fetches on every run,
resetting the work tree to the commit fetched. Resetting to the name
itself resolves to a local branch, which fetching doesn't move.
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